Taken directly from the spring chart:
http://www.airsoftcanada.com/SpringChart.html
Quote:
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Originally Posted by Spring Chart
BB: Excel 0.20g
Piston: SystemA Red Polycarbonate Piston (modified)
Piston Head: SystemA Aluminum w/ Bearings
Cylinder Head: Prometheus
Cylinder: KM TN Taper
Nozzle: SystemA
Spring Guide: Prometheus v2 w/ Bearings
Inner Barrel SystemA 6.04mm BS (335mm)
Chronograph: Shooting Chrony F-1
Average Temperature: 24.54ยบ C
Hop Up: KM Triple Camber RH 55 set OFF
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Note the last item.